Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee129216b510b78…

MALICIOUS

PDF

96.3 KB Created: 2021-09-08 04:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2479750841f4c36f884a81e31795c97 SHA-1: 9a1b911f01cb80bfe185de7026776c79f9df9479 SHA-256: 4ee129216b510b78047a15c7d74102f0fa01d0b9b9ea72c2e95c573370a1360b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=gmat+books+2019+pdf PDF link annotation
    • http://analogsys.com/uploaded/file/154431115060a121ce04e3b.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/26011698320.pdfIn PDF document text
    • https://arerp.kr/data/file///newadevonatulusovekiti.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c2ad2cc2---pilubojogurus.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/tonezusok.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/44936833380.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65949d20f1---14732814364.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/77266334218.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/laverafufasisojat.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32c0e393f---50700547281.pdfIn PDF document text
    • https://room12shio4.com/contents//files/nanoguxapuwurikuvanokujad.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/da7b1b2790788121d46af8453f08f985/wakesipipuwejidowor.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/19891776009.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/pizekonujida.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/947f36e412a2b132f9ae2861cf0c1d0e/tijokakaj.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/farepidoranefosiw.pdfIn PDF document text
    • https://mmszke.hu/files/file/22059168764.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/49948314631.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdfd9cfbb---47081942475.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/viwemixis.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/17f79mf2qaksg9q5sfjt63qmh9/23651992464.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb546afe---fuxemipavamakuf.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8f34d2d2---setenirejozakobuvesevem.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f141d6bab9d---gikunusu.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/wiwudogugipi.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gowowaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 10916 bytes
SHA-256: eb21e529bb8ad952c3f41bfaac5939b47578c20674e3d8148b6b0dcc5ce4b31b
font_02_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 19468 bytes
SHA-256: 1c0d4e0aa95bead6af448d6cf9f9b874b4cf62543be38ed80b0443ae34dbb1af

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